ip nat inside source list nat interface FastEthernet0/0 overload
ip access-list extended nat
 permit ip 10.1.1.0 0.0.0.255 10.2.2.0 0.0.0.255
route-map nat permit 10
 match ip address nat
 set interface Loopback0
interface Loopback0
 ip address 10.10.10.10 255.255.255.255
 ip nat inside
interface FastEthernet0/0
 ip address 10.1.1.1 255.255.255.0 secondary
 ip address 10.2.2.1 255.255.255.0
 ip nat outside
 ip policy route-map nat